Quarkonium production mechanism and EFTs

by Dr Xiangpeng Wang (TUM)

Tuesday 25 Jun 2024, 15:00 → 16:00 Asia/Shanghai

5#/6th-603 - Meeting Room 603 (Science Building)

Abstract: 

Quarkonium production processes (far way from threshold) from colliders are complicated multiscale problems. 
The default tool to study quarkonium production and decay is the non-relativistic QCD (NRQCD) factorization, which factorizes the scale above the heavy quark mass m.
Despite the great success of NRQCD factorization, we have not yet reached a consensus on the production mechanism of quarkonium, especially regarding the values of the three color-octet long distance matrix elements (LDMEs) of J/ψ. In this talk, we address the problem of NRQCD factorization breaking in processes involving two quarkonia and its cure; we apply potential NRQCD effective theory to factorize the LDMEs into gluonic correlators and the related gradient flow (lattice) matching calculations; we use soft-collinear effective theory (SCET) to separate the heavy quark scale m and the scale much larger than m in exclusive quarkonium production processes.
 

Bio:
Xiangpeng got his doctor degree from Hamburg University in 2018. He had his first postdoc position in Argonne national lab and went to Technical University of Munich for his second postdoc period starting from 2021. His main research interests are Quarkonium Physics and applying effective field theories to study both perturbative and nonperturbative aspects of QCD.

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